Jurnal Ilmu Pertanian Indonesia

130-135

Authors: Alpinina Yunitha, Yusli Wardiatno, Fredinan Yulianda

Substrate has an important role for growing and surviving of seagrass as a medium of life and as a supplier of nutrients. Lack of attention towards seagrass is because of less information related to the seagrass ecology itself. The aim of this study is to determine the influence of substrate diameter with it’s density. The study was conducted in April in Bahoi coastal, North Minahasa District, North Sulawesi. This study measured water quality, substrate sampling were taken in the field. The result showed that 6 seagrass species: Enhalus acoroides, Thalassia hemprichii, Halodule uninervis, Cymodecea rotundata, Syringodium isoetifolium, Halpohila ovalis, with good water quality and sand substrate types. This coastal area was dominated by small-sized seagrass. The highest density was found at station B with seagrass type was S. isoetifolium and lowest was at station C with E. acoroides and Sand substrate which had big diameter, type T. hemprichii had high density. Keywords: Desa Bahoi, sand, seagrass, substrate

145-149

Authors: Forcep Rio Indaryanto, Yusli Wardiatno

Lechitocladium angustiovum is fish helminth parasites in the digestive tract to the Rastrelliger genus. The habitat of helminth parasites divided into microhabitat and makrohabitat. Fish helminth parasites infections showed the interaction of extrinsic factors (hosts habitat) and intrinsic factors (biological host). The study was conducted in FebruaryJune 2013 in the waters of the Banten Bay (Banten Province) and Pelabuhan Ratu Bay (West Jawa Province). Microhabitat helminth parasites of L. angustiovum that infect R. brachysoma gastrointestinal tract is the stomach and intestines. The presence of fish helminth parasites in fish is mutually beneficial. Fish helminth parasites get food from the fish but its presence prevents other parasites that infect fish. The presence of these worms in the digestive tract is affected by the presence of copepode and small crustaceans that are influenced by the host biology (growth and gonad development) and environmental waters. The number of L. angustiovum from Banten Bay and Pelabuhan Ratu Bay was not significantly different because of the fish has genetically similar populations. Keywords: Banten Bay, habitat, Lechitocladium angustiovum, Pelabuhan Ratu Bay, Rastrelliger brachysoma, short body mackerel

156-162

Authors: Dwi Yuni Wulandari, Niken Tunjung Murti Pratiwi, Enan Mulyana Adiwilaga

This study was conducted in describing the spatial distribution of phytoplankton in the coast of Tanggerang based on species composition and abundance. This study held on April and August 2013 in 10 sampling station. Sample survey method used to collect the data. Morisita Index of Dispersion used to describe the distribution pattern of phytoplankton and Bray-Curtis Index used to describe the similarity of sampling station based on its abundances of phytoplankton. Based on result of the study, the phytoplankton in the coast of Tangerang consist of three classes, which is Bacillariophyceae (24 genera), Dinophyceae (3 genera), and Cyanophyceae (2 genera). The result shows that the highest composition and abundance is from the species of Bacillariophyceae. The distribution pattern of phytoplankton is group distribution. The distribution of species of phytoplankton and its abundance is different even the sampling station is near each other and environmental parameters that influence. Keywords: phytoplankton, spatial distribution, the coast of Tangerang

168-173

Authors: Fuquh Rahmat Shaleh, Kadarwan Soewardi, Sigid Hariyadi

Sempor Reservoir is one of the reservoir in Central Java. This reservoir has primary function as irrigation and hydropower source. Beside, it also has some benefit for fisheries and tourism activities. Reservoir utilization which has not been optimum yet need some adjustments with water quality and aquatic trophic state in Sempor Reservoir. This study was aimed to determine water quality and aquatic trophic state of Sempor Reservoir. This study was conducted from January to March 2014 with monthly water sampling. Survey method to collect data with stratified random sampling was used for four represented station. Aquatic trophic state determination was based in Carlson Trophic State Index (TSI) measurement. This method used some represented parameters of physics, chemistry and biology such as water transparency, total phosphorus, and chlorophyll-a. The results showed that water quality of Sempor Reservoir was still good for fishery activities. Aquatic trophic state of Sempor Reservoir based on Carlson TSI was classified to low-medium in euthropic category ranging from 50.7164.91. Inlet was the only area which had medium category of eutrophic due to highly nutrient content derived from anthropogenic activities nearby. Keywords: aquatic Trophic state, carlson trophic state index, sempor reservoir

179-182

Authors: Iriani Setyaningsih, Wini Trilaksani, Desniar, Emma Masruroh, Ria Fahleny, Vatin Tri Gentini

Spirulina is a microalgae have a high nutrient content and bioactive compound were good for health. This microalgae can be cultivated indoor or outdoor as needed. One of the applications of Spirulina is for lozenges. The purpose of this study is determine the effect of packaging and shelf life of Spirulina lozenges on the growth of bacteria and fungi. This microalgae can be cultivated indoor or outdoor as needed. One of the applications of Spirulina is for lozenges. Bacteria and fungi still grow on the Spirulina lozenge which packaged using alumunium foil and plastic bottle. However bacteria and fungi total on Spirulina lozenge during storage on 8 weeks are not different. Keywords: lozenge, microbe, packaging, Spirulina

189-196

Authors: Sumardjo, Sutisna Riyanto, Amiruddin Saleh, Dahri, Adi Firmansyah

This research aims: 1) to analyze typology characteristic and conflict mapping in oil palm plantations; 2) to analyze the effectiveness of conflict resolution processes that have taken; 3) to formulate a conflict resolution strategy that is appropriate to the conflict type through collaborative approach base on potential resource and local knowledge. Primary data collected by interviews with local government officials, key figures, and village leaders. Secondary data obtained from village offices, BPS, texbooks, journals, or data from the internet that contains research results related. Data collection techniques used are a combination of the method of triangulation to obtain accurate data. The data collected and processed in a descriptive analysis of quantitative data supporting. Conflict analysis method used in this study is an analysis of the mission and vision conflict phenomena, analyzes aspects of change, stakeholders analysis, perception analysis, analysis of issues, interests analysis, strategy analysis, analysis of engagement, analysis of potential allies, risk analysis, action analysis, and valuation analysis. The results of this study indicate that the conflict in the Sosa, North Sumatera, has come to the level of "tension" or "crisis". Base on study, there are three main issues that people felt in the area around oil palm plantations, covering: issues of land, inadequate farming, the number of unemployment, as well as the limitations of basic facilities in some villages. Third problem is not handled correctly when very likely to trigger conflict, both between citizens and the business community as well as between fellow citizens of the community. Keywords: collaborative approach, conflict, conflict resolution, conflict typology, potenstial resources

204-210

Authors: Imam Wahyudi, Dicky Kristia Dinata Sinaga, Muhran, Lidia Binti Jasni

The aim of this study was to evaluate the effect of tree spacing or planting distance on tree growth characteristic and several physical and mechanical properties of fast growing teak (Tectona grandis) wood from a plantation area in West Java. Growth characteristics of all trees within the plot of each planting distance were evaluated, while physical-mechanical properties were represented by 6 selected trees of each planting distance. The results showed that growth characteristics were significantly influenced by tree spacing, while wood properties were not. The wider spacing (3 by 3 m) tends to produce bigger stem diameter, but shorter tree height, shorter clear bole height, and greater branches. Although tree spacing of 3 by 3 m is more favored by the farmers since it provides more space for agroforestry activity, such spacing is not recommended to be applied in order to produce the best timber from teak plantation. Keywords: density, faster-grown teak, specific gravity, Tectona grandis, wood hardness